If you have the GPS model, you need a iPhone 5s or later. For GPS + Cellular, you need iPhone 6 or lIf you have the GPS model, you need a iPhone 5s or later. For GPS + Cellular, you need iPhone 6 or later.
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1GB = 1 billion bytes; actual formatted capacity less.
Apple Watch Series 3 has a water resistance rating of 50 meters under ISO standard 22810:2010. This means that it may be used for shallow-water activities like swimming in a pool or ocean. However, Apple Watch Series 3 should not be used for scuba diving, waterskiing, or other activities involving high-velocity water or submersion below shallow depth.